/*
 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.java.swing.plaf.windows;

import sun.swing.SwingUtilities2;

import java.awt.*;

import javax.swing.*;
import javax.swing.plaf.UIResource;

import static com.sun.java.swing.plaf.windows.TMSchema.*;

/**
 * A collection of static utility methods used for rendering the Windows look
 * and feel.
 *
 * @author Mark Davidson
 * @since 1.4
 */
public class WindowsGraphicsUtils {

  /**
   * Renders a text String in Windows without the mnemonic.
   * This is here because the WindowsUI hierarchy doesn't match the Component hierarchy. All
   * the overriden paintText methods of the ButtonUI delegates will call this static method.
   * <p>
   *
   * @param g Graphics context
   * @param b Current button to render
   * @param textRect Bounding rectangle to render the text.
   * @param text String to render
   */
  public static void paintText(Graphics g, AbstractButton b,
      Rectangle textRect, String text,
      int textShiftOffset) {
    FontMetrics fm = SwingUtilities2.getFontMetrics(b, g);

    int mnemIndex = b.getDisplayedMnemonicIndex();
    // W2K Feature: Check to see if the Underscore should be rendered.
    if (WindowsLookAndFeel.isMnemonicHidden() == true) {
      mnemIndex = -1;
    }

    XPStyle xp = XPStyle.getXP();
    if (xp != null && !(b instanceof JMenuItem)) {
      paintXPText(b, g, textRect.x + textShiftOffset,
          textRect.y + fm.getAscent() + textShiftOffset,
          text, mnemIndex);
    } else {
      paintClassicText(b, g, textRect.x + textShiftOffset,
          textRect.y + fm.getAscent() + textShiftOffset,
          text, mnemIndex);
    }
  }

  static void paintClassicText(AbstractButton b, Graphics g, int x, int y,
      String text, int mnemIndex) {
    ButtonModel model = b.getModel();

        /* Draw the Text */
    Color color = b.getForeground();
    if (model.isEnabled()) {
      /*** paint the text normally */
      if (!(b instanceof JMenuItem && model.isArmed())
          && !(b instanceof JMenu && (model.isSelected() || model.isRollover()))) {
                /* We shall not set foreground color for selected menu or
                 * armed menuitem. Foreground must be set in appropriate
                 * Windows* class because these colors passes from
                 * BasicMenuItemUI as protected fields and we can't
                 * reach them from this class */
        g.setColor(b.getForeground());
      }
      SwingUtilities2.drawStringUnderlineCharAt(b, g, text, mnemIndex, x, y);
    } else {        /*** paint the text disabled ***/
      color = UIManager.getColor("Button.shadow");
      Color shadow = UIManager.getColor("Button.disabledShadow");
      if (model.isArmed()) {
        color = UIManager.getColor("Button.disabledForeground");
      } else {
        if (shadow == null) {
          shadow = b.getBackground().darker();
        }
        g.setColor(shadow);
        SwingUtilities2.drawStringUnderlineCharAt(b, g, text, mnemIndex,
            x + 1, y + 1);
      }
      if (color == null) {
        color = b.getBackground().brighter();
      }
      g.setColor(color);
      SwingUtilities2.drawStringUnderlineCharAt(b, g, text, mnemIndex, x, y);
    }
  }

  static void paintXPText(AbstractButton b, Graphics g, int x, int y,
      String text, int mnemIndex) {
    Part part = WindowsButtonUI.getXPButtonType(b);
    State state = WindowsButtonUI.getXPButtonState(b);
    paintXPText(b, part, state, g, x, y, text, mnemIndex);
  }

  static void paintXPText(AbstractButton b, Part part, State state,
      Graphics g, int x, int y, String text, int mnemIndex) {
    XPStyle xp = XPStyle.getXP();
    if (xp == null) {
      return;
    }
    Color textColor = b.getForeground();

    if (textColor instanceof UIResource) {
      textColor = xp.getColor(b, part, state, Prop.TEXTCOLOR, b.getForeground());
      // to work around an apparent bug in Windows, use the pushbutton
      // color for disabled toolbar buttons if the disabled color is the
      // same as the enabled color
      if (part == Part.TP_BUTTON && state == State.DISABLED) {
        Color enabledColor = xp.getColor(b, part, State.NORMAL,
            Prop.TEXTCOLOR, b.getForeground());
        if (textColor.equals(enabledColor)) {
          textColor = xp.getColor(b, Part.BP_PUSHBUTTON, state,
              Prop.TEXTCOLOR, textColor);
        }
      }
      // only draw shadow if developer hasn't changed the foreground color
      // and if the current style has text shadows.
      TypeEnum shadowType = xp.getTypeEnum(b, part,
          state, Prop.TEXTSHADOWTYPE);
      if (shadowType == TypeEnum.TST_SINGLE ||
          shadowType == TypeEnum.TST_CONTINUOUS) {
        Color shadowColor = xp.getColor(b, part, state,
            Prop.TEXTSHADOWCOLOR, Color.black);
        Point offset = xp.getPoint(b, part, state, Prop.TEXTSHADOWOFFSET);
        if (offset != null) {
          g.setColor(shadowColor);
          SwingUtilities2.drawStringUnderlineCharAt(b, g, text, mnemIndex,
              x + offset.x,
              y + offset.y);
        }
      }
    }

    g.setColor(textColor);
    SwingUtilities2.drawStringUnderlineCharAt(b, g, text, mnemIndex, x, y);
  }

  static boolean isLeftToRight(Component c) {
    return c.getComponentOrientation().isLeftToRight();
  }

  /*
   * Repaints all the components with the mnemonics in the given window and
   * all its owned windows.
   */
  static void repaintMnemonicsInWindow(Window w) {
    if (w == null || !w.isShowing()) {
      return;
    }

    Window[] ownedWindows = w.getOwnedWindows();
    for (int i = 0; i < ownedWindows.length; i++) {
      repaintMnemonicsInWindow(ownedWindows[i]);
    }

    repaintMnemonicsInContainer(w);
  }

  /*
   * Repaints all the components with the mnemonics in container.
   * Recursively searches for all the subcomponents.
   */
  static void repaintMnemonicsInContainer(Container cont) {
    Component c;
    for (int i = 0; i < cont.getComponentCount(); i++) {
      c = cont.getComponent(i);
      if (c == null || !c.isVisible()) {
        continue;
      }
      if (c instanceof AbstractButton
          && ((AbstractButton) c).getMnemonic() != '\0') {
        c.repaint();
        continue;
      } else if (c instanceof JLabel
          && ((JLabel) c).getDisplayedMnemonic() != '\0') {
        c.repaint();
        continue;
      }
      if (c instanceof Container) {
        repaintMnemonicsInContainer((Container) c);
      }
    }
  }
}
